Quarterly report pursuant to Section 13 or 15(d)

Stock options and warrants (Stock incentive plan options) (Narrative) (Details)

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Stock options and warrants (Stock incentive plan options) (Narrative) (Details) (USD $)
 6 Months Ended 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
Minimum [Member]
Jun. 30, 2014
Maximum [Member]
Jun. 30, 2014
Stock Incentive Plan [Member]
Jun. 30, 2013
Stock Incentive Plan [Member]
Jun. 30, 2014
Stock Incentive Plan [Member]
Independent Directors [Member]
Jun. 30, 2014
Stock Incentive Plan [Member]
Officers and Employees [Member]
Jun. 30, 2014
Stock Incentive Plan [Member]
Consultant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares reserved under the Plan 3,673,126 1,912,205              
Incentive stock options exercised to purchase common shares 39,079       39,079        
Total proceeds from stock options exercised to purchase common shares $ 82,000                
Intrinsic value of stock options exercised to purchase common shares 14,000                
Options granted         652,100   221,000 406,100 25,000
Weighted average exercise price of options granted         $ 2.28   $ 2.27 $ 2.28 $ 2.38
Weighted-average fair value of options granted         $ 1.91        
Expiration period     3 years 5 years     10 years 10 years 10 years
Vesting period             1 year 2 years 2 years
Vesting rate             25.00% 50.00% 50.00%
Options forfeited         36,040        
Options expired         31,475 12,270      
Options forfeited, unvested         4,565 7,308      
Options expired, exercise price         $ 36.66 $ 20.16      
Options forfeited, unvested, exercise price         $ 2.12        
Fair value of options vested         414,000 622,000      
Expected to vest         562,000        
Unrecognized compensation cost         $ 592,000        
Unrecognized compensation cost, period for recognition         1 year